拓展就是在引导学生学习完教材内容的基础上,教师扩展一些与教材内容相关的知识,以此激发学生学习兴趣,开拓学生视野,增长学生见识,培养学生理论联系实际的能力和解决问题的能力。这就要求教师及时对生物知识进行合理拓展与延伸,甚至是各学科知识之间的合理迁移和渗透,以“举一反三”的方式使课堂充满生命活力,最终激发出学生自学的潜能。一、建立兴趣小组拓展“教师”数量,以培养“小老师”的自学能力托尔斯泰说:“成功的教学需要的不是强制,而是激 Expansion is to guide students to learn the finished textbook content based on the teacher to expand some of the textbook content and related knowledge, in order to stimulate students interest in learning to develop students ’horizons, increase students’ knowledge and develop students ability to contact with practice and problem-solving . This requires teachers to reasonably expand and extend the biological knowledge in a timely manner, and even the reasonable migration and infiltration of the knowledge among different disciplines to make the classroom full of life and vitality in the way of ”giving top priority to the one“ and ultimately inspire the potential of students’ self-learning. First, the establishment of interest groups to expand ”teacher “ number to cultivate ”small teacher “ self-learning ability Tolstoy said: ”The successful teaching needs is not mandatory, but rather excited